78194402120 has 32 divisors (see below), whose sum is σ = 175946352120. Its totient is φ = 31276170240.

The previous prime is 78194402107. The next prime is 78194402141. The reversal of 78194402120 is 2120449187.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 47192348644 + 31002053476 = 217238^2 + 176074^2 .

It is a super-2 number, since 2×78194402120² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1043510 + ... + 1115930.

Almost surely, 2^78194402120 is an apocalyptic number.

It is an amenable number.

78194402120 is an abundant number, since it is smaller than the sum of its proper divisors (97751950000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78194402120 is a wasteful number, since it uses less digits than its factorization.

78194402120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99425 (or 99421 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 78194402120 in words is "seventy-eight billion, one hundred ninety-four million, four hundred two thousand, one hundred twenty".